The incident began at about 8:30 p.m. at the New Jersey airport when an Alaska Airlines employee approached two men at Gate 30 in Terminal A and the men fled, causing the employee to hit an alarm, according to the Port Authority of New York and New Jersey, which operates the airport.

The alarm triggered a panicked evacuation of the terminal, with passengers ditching their luggage and heading for the nearest exits as fast as they could.

The alarm caused about 150 to 200 passengers in the terminal to “self-evacuate” outside Gate 37, the Port Authority said.

Most terrifying few minutes of my life. Being in terminal A at EWR about to board my flight when a flight attendant starts screaming evacuate. Absolute chaos. Currently standing on an active tarmac. I just want to go home. pic.twitter.com/5BkWFUntVm

“I ran with the crowds, hid under some seats, looked for an exit, headed out to the tarmac,” tweeted Erin Fors, one of those who ended up on the tarmac. “Sounded like gun shots but after seeing the damage in this terminal, it’s more likely it was glass being shattered from people jumping. Terrifying.”

Shooting scare at Newark Airport. Police arrived in seconds. We are all outside on the runway. Terrified . pic.twitter.com/WLDLKb4mKV